GSW Hot Water Heaters

GSW hot water heaters are built to be energy efficient, safe, and always reliable, which is why they have become the most popular in Canada.

GSW-conventional-ventAcross the country, GSW hot water heaters have a great reputation for their excellent value which is how they’ve gained their tremendous loyalty and trust from their Canadian users. They design their product with the intention of creating the safest and most dependable energy efficient water heaters. So if you’re looking to change your home’s water heater, look no further than at the amazing product created by GSW.

If you’re looking for an environmentally friendly water heater, even GSW’s entry level models are being recognized for their energy savings by Natural Resources Canada. In the current expanding market for water heaters, GSW stays ahead of the curve by using the latest innovative technology to create an outstanding product made with the homeowners need for safety in mind. GSW hot water heaters include award winning designs such as Flame Safe and to Guard technology which prevents flammable vapour ignition.

GSW-powerHere at DeMark Home Ontario our dear customers are our priority, which is why we choose to supply our customers with the best technology from GSW hot water heaters. No matter if your budget or lifestyle needs an electric, gas, or tankless water heater, DeMark is here to help.

DeMark Home Ontario offers Ontario’s most affordable, worry-free rental program. We pride ourselves on delivering excellent service with top of the line equipment to our customers. With our 24/7/365 maintenance program you are getting lifetime repairs and service on all parts and labour and remain protected and worry free from any unexpected costs. By renting through DeMark you never have to worry about breakdowns, costs and replacements for your water heater.

GSW-elDeMark Home Ontario makes renting a water heater simple. You do not have to pay a single cent up-front when you rent, there is no installation free, and your single monthly payment includes everything. You can save up to 30% on energy with your brand new high efficiency water heater, and the sooner you upgrade the sooner you can save.


If you aren’t convinced already, here’s a list of the perks that come with DeMark Home Ontario’s water heater rental program:

2 Months free rent
Reduced rental rates
Free installation and removal of your existing tank
No up-front equipment cost
No hidden charges
Free upgrade your venting pipes at no extra cost in order to bring you up to current TSSA code
Free maintenance program 24/7/365
Free lifetime service and repairs on all parts
New Energy Saving water heaters
Quicker heating time and increased water output
Transferrable to the next owner should you sell your home
• You will not be receiving any extra bills. Rental water heater charges will appear in the ‘Other Companies’ section of your Enbridge Gas Distribution Bill.


Our services are guaranteed. Enjoy peace of mind and the best Ontario heating and cooling service.

Contact DeMark Home Ontario For a FREE Quote Today!

We will be happy to assist you with any questions or enquires regarding your water heater needs. Our team of dedicated and experienced professionals aim to provide homeowners with fast and reliable response and water heating solutions.

If you are looking to replace your old water tank to energy efficient model call DeMark Home Ontario -heating, cooling and hot water heating expert for more detail on specifications and water heater installation. Call today at 647-847-2998 or submit your request online.

Easy Rentals...

get total piece of mind with our High Efficiency Furnace and Air Conditioner Rental Program.
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  • Get A Quote Today! Free in-home estimate!
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Upgrading to a high-efficiency heating and cooling system offers more than energy savings.

Take advantage of these rebates today!


This item comes with absolutely free standard installation. We’ll ensure that the product is completely installed to code and fully functioning prior to leaving.


Great news! Receive a brand new digital thermostat absolutely free when renting this HVAC product from DeMark Home Ontario.


Great news! When renting a furnace or air conditioner, you’ll get your first 2 months absolutely rent free.


Great news! When renting a furnace and air conditioner together, you’ll get your first 3 months absolutely rent free.


This product carries a manufacturer warranty and we’re happy to explain it in full to you. Feel free to get in touch with us for more information or see the Warranty Information tab for more information


If your order is placed and confirmed by 11am, we can have your HVAC product installed within the same day.

Certain conditions apply, not available on all products.


Great news! When renting a qualifying water heater, you’ll get your first 2 months absolutely rent free.


This water heater is subject to reduced rental rates based on the DHO discount program. Save money on your bill every single month!

Some conditions apply


Save money on this item when buying it along with a qualifying high-efficiency furnace or air conditioner.

Some conditions apply


Promotional code can be found on the eFlyer, Brochure or promotional email that you received from us.

*If you are an existing customer please refer to the mail or email that was sent to you after the installation of your equipment as it contains your promotional code. If you are having troubles locating it please call us and one of our Customer Service Representatives will be happy to assist you.

  • Please fill out the form below in order to schedule service and be sure that your request will be processed promptly and you will hear back from us shortly.

Notice for Power Vent Water Heater Customers

Effective August 2007, gas code requires technicians working on venting to replace black ABS vent pipe with white UL-certified vent pipe.

We will upgrade your venting pipes at no additional cost.

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